Robertson (crater)
Encyclopedia
Robertson is an important lunar
impact crater
that is located on the far side of the Moon
, just beyond the western limb. It lies just to the south of Berkner
, a formation with a comparable size but more eroded features. Just to the east is Helberg
, and to the southwest is Alter
.
The inner wall of the crater rim has a wide, complex formation of multiple terraces. The rim is approximately circular, but with an irregular outline where various terraces have slumped away. The interior has a central peak at the mid-point, and this is joined to a rugged stretch of ground that connects with the northeastern rim. A band of light-hued ray material
covers the southern half of the crater floor and rim.
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
impact crater
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...
that is located on the far side of the Moon
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
, just beyond the western limb. It lies just to the south of Berkner
Berkner (crater)
Berkner is a lunar crater that is located on the far side of the Moon, just past the western limb. It is attached to the east-southeast rim of the crater Parenago. Just to the south is the Robertson, and to the southeast is Helberg....
, a formation with a comparable size but more eroded features. Just to the east is Helberg
Helberg (crater)
Helberg is a lunar crater that is located just behind the western limb of the Moon, on the far side from the Earth. Due to libration this part of the surface is sometimes brought into view, and the crater is visible under suitable lighting conditions...
, and to the southwest is Alter
Alter (crater)
Alter is a lunar impact crater that is located in the northern hemisphere on the far side of the Moon. It lies to the southwest of the larger crater Robertson, and to the east of Ohm....
.
The inner wall of the crater rim has a wide, complex formation of multiple terraces. The rim is approximately circular, but with an irregular outline where various terraces have slumped away. The interior has a central peak at the mid-point, and this is joined to a rugged stretch of ground that connects with the northeastern rim. A band of light-hued ray material
Ray system
A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The rays can extend for lengths up to several times the diameter of their originating crater, and are often accompanied by...
covers the southern half of the crater floor and rim.